Nature-based therapy is a developing and integrative field of practice in counselling and psychotherapy, influenced by a diverse range of therapeutic approaches (Nash, 2020), and is typically, but not always, practised in an outdoor setting. The field of practice is yet to develop clearly defined nomenclature, with a diverse range of terms currently used (Revell et al., 2014). In addition to therapist-led oneto-one counselling and psychotherapy, the field includes ecotherapy and eco-psychotherapy as well as nature-based therapeutic interventions (e.g. adventure, wilderness, horticultural, woodland and animal-assisted) often led by other professionals, in groups and of longer duration than the therapy hour (Jordan, 2015).The focus of the present study is on the subset of practice offering one-to-one nature-based counselling and psychotherapy sessions with children and young people (CYP), in a typical therapy hour, with a qualified therapist. The term "nature-based therapy" is used to refer to this specific practice, recognising that this is not an agreed, delineated term nor usually restricted to this context. "Therapists" is used to refer collectively to CYP psychotherapists and counsellors and play therapists practising this approach.There are good reasons to think that nature could be supportive of therapeutic processes. A meta-analysis by McMahan and Estes (2015) concluded that nature exposure consistently promotes decreases in negative affect and increases in positive affect (see also Lackey et al., 2019). The measurable psychological construct of nature connectedness (Richardson et al., 2019) has been linked with improved emotional regulation (Richardson & McEwan, 2018), to reduced anxiety and depression, and increased happiness and life sat-